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Finding the Fourth Proportional to 121.53, 167.31 and 113.25

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Solution

The fourth proportional to 121.53, 167.31 and 113.25 is: 155.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.53 : 167.31 = 113.25 : x
  2. Step 2: Convert to fraction form
    121.53/167.31 = 113.25/x
  3. Step 3: Cross multiply
    121.53x = 167.31 × 113.25
  4. Step 4: Simplify right side
    121.53x = 18,947.86
  5. Step 5: Solve for x
    x = 18,947.86/121.53
  6. Step 6: Final answer
    x = 155.91

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.